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   1 /*
   2  * Copyright © 2012 Mike Beattie <mike@ethernal.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 package org.altusmetrum.AltosDroid;
  19
  20 import java.lang.ref.WeakReference;
  21 import java.util.ArrayList;
  22 import java.util.concurrent.TimeoutException;
  23
  24 import android.app.Notification;
  25 //import android.app.NotificationManager;
  26 import android.app.PendingIntent;
  27 import android.app.Service;
  28 import android.bluetooth.BluetoothDevice;
  29 import android.content.Intent;
  30 //import android.os.Bundle;
  31 import android.os.IBinder;
  32 import android.os.Handler;
  33 import android.os.Message;
  34 import android.os.Messenger;
  35 import android.os.RemoteException;
  36 import android.util.Log;
  37 import android.widget.Toast;
  38
  39 import org.altusmetrum.AltosLib.*;
  40
  41 public class TelemetryService extends Service {
  42
  43         private static final String TAG = "TelemetryService";
  44         private static final boolean D = true;
  45
  46         static final int MSG_REGISTER_CLIENT   = 1;
  47         static final int MSG_UNREGISTER_CLIENT = 2;
  48         static final int MSG_CONNECT           = 3;
  49         static final int MSG_CONNECTED         = 4;
  50         static final int MSG_CONNECT_FAILED    = 5;
  51         static final int MSG_DISCONNECTED      = 6;
  52         static final int MSG_TELEMETRY         = 7;
  53
  54         public static final int STATE_NONE       = 0;
  55         public static final int STATE_READY      = 1;
  56         public static final int STATE_CONNECTING = 2;
  57         public static final int STATE_CONNECTED  = 3;
  58
  59         // Unique Identification Number for the Notification.
  60         // We use it on Notification start, and to cancel it.
  61         private int NOTIFICATION = R.string.telemetry_service_label;
  62         //private NotificationManager mNM;
  63
  64         ArrayList<Messenger> mClients = new ArrayList<Messenger>(); // Keeps track of all current registered clients.
  65         final Handler   mHandler   = new IncomingHandler(this);
  66         final Messenger mMessenger = new Messenger(mHandler); // Target we publish for clients to send messages to IncomingHandler.
  67
  68         // Name of the connected device
  69         private BluetoothDevice device           = null;
  70         private AltosBluetooth  mAltosBluetooth  = null;
  71         private AltosConfigData mConfigData      = null;
  72         private TelemetryReader mTelemetryReader = null;
  73
  74         // internally track state of bluetooth connection
  75         private int state = STATE_NONE;
  76
  77         // Handler of incoming messages from clients.
  78         static class IncomingHandler extends Handler {
  79                 private final WeakReference<TelemetryService> service;
  80                 IncomingHandler(TelemetryService s) { service = new WeakReference<TelemetryService>(s); }
  81
  82                 @Override
  83                 public void handleMessage(Message msg) {
  84                         TelemetryService s = service.get();
  85                         switch (msg.what) {
  86                         case MSG_REGISTER_CLIENT:
  87                                 s.mClients.add(msg.replyTo);
  88                                 try {
  89                                         // Now we try to send the freshly connected UI any relavant information about what
  90                                         // we're talking to - Basically state and Config Data.
  91                                         msg.replyTo.send(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, s.state, -1, s.mConfigData));
  92                                 } catch (RemoteException e) {
  93                                         s.mClients.remove(msg.replyTo);
  94                                 }
  95                                 if (D) Log.d(TAG, "Client bound to service");
  96                                 break;
  97                         case MSG_UNREGISTER_CLIENT:
  98                                 s.mClients.remove(msg.replyTo);
  99                                 if (D) Log.d(TAG, "Client unbound from service");
 100                                 break;
 101                         case MSG_CONNECT:
 102                                 if (D) Log.d(TAG, "Connect command received");
 103                                 s.device = (BluetoothDevice) msg.obj;
 104                                 s.startAltosBluetooth();
 105                                 break;
 106                         case MSG_CONNECTED:
 107                                 if (D) Log.d(TAG, "Connected to device");
 108                                 s.connected();
 109                                 break;
 110                         case MSG_CONNECT_FAILED:
 111                                 if (D) Log.d(TAG, "Connection failed... retrying");
 112                                 s.startAltosBluetooth();
 113                                 break;
 114                         case MSG_DISCONNECTED:
 115                                 // Only do the following if we haven't been shutdown elsewhere..
 116                                 if (s.device != null) {
 117                                         if (D) Log.d(TAG, "Disconnected from " + s.device.getName());
 118                                         s.stopAltosBluetooth();
 119                                 }
 120                                 break;
 121                         case MSG_TELEMETRY:
 122                                 s.sendMessageToClients(Message.obtain(null, AltosDroid.MSG_TELEMETRY, msg.obj));
 123                                 break;
 124                         default:
 125                                 super.handleMessage(msg);
 126                         }
 127                 }
 128         }
 129
 130         private void sendMessageToClients(Message m) {
 131                 for (int i=mClients.size()-1; i>=0; i--) {
 132                         try {
 133                                 mClients.get(i).send(m);
 134                         } catch (RemoteException e) {
 135                                 mClients.remove(i);
 136                         }
 137                 }
 138         }
 139
 140         private void stopAltosBluetooth() {
 141                 if (D) Log.d(TAG, "stopAltosBluetooth(): begin");
 142                 setState(STATE_READY);
 143                 if (mTelemetryReader != null) {
 144                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping TelemetryReader");
 145                         mTelemetryReader.interrupt();
 146                         try {
 147                                 mTelemetryReader.join();
 148                         } catch (InterruptedException e) {
 149                         }
 150                         mTelemetryReader = null;
 151                 }
 152                 if (mAltosBluetooth != null) {
 153                         if (D) Log.d(TAG, "stopAltosBluetooth(): stopping AltosBluetooth");
 154                         mAltosBluetooth.close();
 155                         mAltosBluetooth = null;
 156                 }
 157                 device = null;
 158                 mConfigData = null;
 159         }
 160
 161         private void startAltosBluetooth() {
 162                 if (mAltosBluetooth == null) {
 163                         if (D) Log.d(TAG, String.format("startAltosBluetooth(): Connecting to %s (%s)", device.getName(), device.getAddress()));
 164                         mAltosBluetooth = new AltosBluetooth(device, mHandler);
 165                         setState(STATE_CONNECTING);
 166                 } else {
 167                         // This is a bit of a hack - if it appears we're still connected, we treat this as a restart.
 168                         // So, to give a suitable delay to teardown/bringup, we just schedule a resend of a message
 169                         // to ourselves in a few seconds time that will ultimately call this method again.
 170                         // ... then we tear down the existing connection.
 171                         // We do it this way around so that we don't lose a reference to the device when this method
 172                         // is called on reception of MSG_CONNECT_FAILED in the handler above.
 173                         mHandler.sendMessageDelayed(Message.obtain(null, MSG_CONNECT, device), 3000);
 174                         stopAltosBluetooth();
 175                 }
 176         }
 177
 178         private synchronized void setState(int s) {
 179                 if (D) Log.d(TAG, "setState(): " + state + " -> " + s);
 180                 state = s;
 181
 182                 // This shouldn't be required - mConfigData should be null for any non-connected
 183                 // state, but to be safe and to reduce message size
 184                 AltosConfigData acd = (state == STATE_CONNECTED) ? mConfigData : null;
 185
 186                 sendMessageToClients(Message.obtain(null, AltosDroid.MSG_STATE_CHANGE, state, -1, acd));
 187         }
 188
 189         private void connected() {
 190                 try {
 191                         mConfigData = mAltosBluetooth.config_data();
 192                 } catch (InterruptedException e) {
 193                 } catch (TimeoutException e) {
 194                         // If this timed out, then we really want to retry it, but
 195                         // probably safer to just retry the connection from scratch.
 196                         mHandler.obtainMessage(MSG_CONNECT_FAILED).sendToTarget();
 197                         return;
 198                 }
 199
 200                 setState(STATE_CONNECTED);
 201
 202                 mTelemetryReader = new TelemetryReader(mAltosBluetooth, mHandler);
 203                 mTelemetryReader.start();
 204         }
 205
 206
 207         @Override
 208         public void onCreate() {
 209                 // Create a reference to the NotificationManager so that we can update our notifcation text later
 210                 //mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 211
 212                 setState(STATE_READY);
 213         }
 214
 215         @Override
 216         public int onStartCommand(Intent intent, int flags, int startId) {
 217                 Log.i("TelemetryService", "Received start id " + startId + ": " + intent);
 218
 219                 CharSequence text = getText(R.string.telemetry_service_started);
 220
 221                 // Create notification to be displayed while the service runs
 222                 Notification notification = new Notification(R.drawable.am_status_c, text, 0);
 223
 224                 // The PendingIntent to launch our activity if the user selects this notification
 225                 PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
 226                                 new Intent(this, AltosDroid.class), 0);
 227
 228                 // Set the info for the views that show in the notification panel.
 229                 notification.setLatestEventInfo(this, getText(R.string.telemetry_service_label), text, contentIntent);
 230
 231                 // Set the notification to be in the "Ongoing" section.
 232                 notification.flags |= Notification.FLAG_ONGOING_EVENT;
 233
 234                 // Move us into the foreground.
 235                 startForeground(NOTIFICATION, notification);
 236
 237                 // We want this service to continue running until it is explicitly
 238                 // stopped, so return sticky.
 239                 return START_STICKY;
 240         }
 241
 242         @Override
 243         public void onDestroy() {
 244
 245                 // Stop the bluetooth Comms threads
 246                 stopAltosBluetooth();
 247
 248                 // Demote us from the foreground, and cancel the persistent notification.
 249                 stopForeground(true);
 250
 251                 // Tell the user we stopped.
 252                 Toast.makeText(this, R.string.telemetry_service_stopped, Toast.LENGTH_SHORT).show();
 253         }
 254
 255         @Override
 256         public IBinder onBind(Intent intent) {
 257                 return mMessenger.getBinder();
 258         }
 259
 260
 261 }